Steam-inlet valve.



Patented Mar. I9, IQD., F. SCHUMNN.

STEAM INLET VALVE. (Apphcatxon lel Dec 13. 1900 l 2 Sheet -Sh 2Sheets--Sheet 2,.

Patented Mar. I9, |90I.

F. SCHUMANN. STEAMINLET- vALvE.

(Application led Dec. 13, 1900` m. m N N I n u u .O n n WN s u n mu n nu f w\m\| m. l .r N t b (No Model.)

Sterns ernst sinon,

FRANCIS SCHUMANN, OF PHILADELPHIA, PENNSYLVANIA.

STEAM=lNLET VALVE.

SPECEFICTION forming part of Letters Patent No. 670,330, dated March 19,1901.

Application filed December 13, 1900. Serial No. 39,741. (No model.)

To aZ whom it may concern:

Be it known that I, FRANCIS SCHUMANN, a citizen ofthe United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Steam Inlet Valves, of which the following is aspecification.

My invention relates to certain improvements in high-pressure steam andexhaust valves to be used in connection with engines of the Corlisstype, having for one object the provision of a valve which will by itsconstruction allow the clearance to be reduced to a ininiin u m.

Further objects of my invention are to construct a valve of the abovetype which shall be at all times balanced and which may be adjusted tocompensate for any wear either of the valve or or" the valve-chamber.

These objects I attain as hereinafter set forth, reference being had tothe accompanying drawings, in which- Figure 1 is a longitudinalsectional view through one end of an engine-cylinder, show` ing theposition of one of my improved valves in relation to one of the portsand to the interior of the cylinder. Fig. 2 is a side elevation of my'inproved valve. Fig. 3 is a plan view of the same with one sectionofthe valve removed. Fig. e is an end view of the valve, showing therecess for the reception of the T end of the valve-rod. Fig. 5 is across-secf tional View on the line 5 Fig. 2; and Fig. 6 is a sectionalview similar to l, but taken through one or" the equalizing-passages inthe body of the valve.

In Fig. l, A is a portion of one end of an engine-cylinder, and A' aportion of the head thereof. B is the interior or the cylinder, intowhich open two ports b b, leadingiroin a valvechamber BC A passage b,divided in the present instance into two where it enters thevalve-chamber, connects the saine to a steamsupply passage or to theexhaust-passage, as the case may e.

At a point in the .falve-chaniber preferably one undred and twentydegrees distant from each ot' the two ports Z) b a recess or port h2opens, being made rectangular in the present instance and extending thelength of the valve-chamber. A valve is constructed to nt the chamberand is of a section preferably tf-shaped, there being a valve-face atthe extremity of each limb. It is made in two sections, C and CX, thelatter being wedge- Shaped and the former having a bolting-section c,the face of which runs at an angle to the axis ot' the valve and onwhich the section C is constructed to slide. Bolts E serve to hold thetwo sections together, being tapped into the section C' and projectingthrough holes in the bolting-section c, which are elongated in adirection parallel to the axis of the valve. Each of these bolts has anut c on it and a hole c through its end for a Cotter-pin. A tongue orprojection c on one of the valvesections, in the present case on C, ismade to tit a corresponding groove or recess in the other valve-section,making it possible When the nuts on the bolts E are slacked to move onesection longitudinally upon the other, while preventing any side motionthereof. This allows any wear of the valve or chamber to be taken up,for by moving one of the parts in one direction their combined diameterwill be increased.

Ribs g2 and end pieces gS serve to hold together the face-sections g gand the boltingsection c of the part C. The parts g g and C' of thevalve have recesses h in their faces, of the shape plainly shown indotted lines in Fig. 4, and passages h', running through the ribs g2,connect certain of the recesses g with the corresponding recessesg.

@ne end of the section C of the valve is recessed at i to receive theT-shaped end of the valve-rod of a type common in Corliss engines. Therecess is preferably of the same width as the tongue or projection c',which is cut away' in forming said recess, thus allowing the crossprojection or T end ofthe valverod to ente. the groove and to engage thesection C/ of the valve, as shown in Fig. 3. A projection t" on theopposite end of the section C from the recess 'L' allows free access ofsteam to the end of the valve, and this, together with the peculiarshape of the valve, is one of the features tending to keep it balanced.

It will be seen that the part Oand the section g of the part C governthe admission of steam to the cylinder and that the sectiong is added tocomplete the valve mechanically.

In order that there may always be equal pressure under all three of thefaces g, g, and

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C, the passages 7L' connect the recesses in the face g with those in theface g, and hence when the valve is in its closed positiomasin Fig. 6,they connect the interior ot' the cylinder with the false port b2. Thusit will be noted that the valve is at all times balancedin other words,that the work of reciprocating it is not increased by the pressure ofthe steam. This is an important gain over what has heretofore beenpossiblein Gorliss engines, as ordinarily a very considerable part ofthe work of the engine has been expended in operating the valve-gear. Bythe use of my improved valves not only by far the larger part of thiswork is saved, but it is possible to construct the valve-gear of muchlighter material than has heretofore been permissible.

By means of the movable wedge-shaped section C' it is possible toadjust. the valve to prevent leakage of steam in case of wear either ofthe valve or of the valve-chamber, for by slacking the nuts e and movingthe sections together the diameter of the valve may beincreased to thedesired amount, thus making it possible to compensate for such wear.

I claim as my inventionl. The combination in a valve for a steamengine,of a casting having in ita valve-chan1- ber, a passage connecting thechamber with a source of steam-supply, ports in the chambercommunicating with the engine-cylinder and a three-faced valve in thechamber two of the faces thereof con trolling the passage of steamthrough the ports, substantially as described.

2. The combination in an engine-valve, of

a cylinder-casting, a valve-chamber therein,

connection between the chamber and the source of steanrsupply, two portsconnected to one end of the cylinder, and a closed passage in thecasting forming a false port, all opening into the chamber, and athree-faced valve in the chamber constructed to control the passage ofsteam from the source of supply through the ports, substantially asdescribed.

3. The combination with a valve-chamber ofthe character described, of athree-faced valve, said valve being in two parts adjustably connectedtogether, one of said parts consisting of two face-sections and aVboltingsection connected by ribs, the other part being wedge-shaped andconstructed to move on the iirst part, substantially as described.

4. In a valve of the character described, the combination of awedge-shapedpart or piece with a second part consisting of twoface-sections connected to a bolting-section by ribs, the saidboltingsection having elongated holes through it, bolts for holding thetwo parts of the valve rigidly together, said bolts passing through thesaid. holes and entering the wedge-shaped part of the valve, atongue onone of said valve parts, and a corresponding groove on the other,whereby when the bolts are slackencd, the two sections may be movedlongitudinally upon one another, substantially as described.

5. A threefaced valve of the character described, constructed to (it acylindrical valvechamber, one of the faces thereof being movablerelatively to the others, whereby the circular diameter of the valvemaybe varied, substantially as described.

6. The combination of an engine-cylinder casting, a cylindricalvalve-chamber therein, a passage from a source of steam-supply andpassages or ports from the engine-cylinder, all opening into saidchamber, a false passage or port, and a three-faced valve, having two ofits faces adapted to cover the two ports of the cylinder, and its thirdface adapted to cover the false port, passages through the valve givingcommunication between the false port and one of the ports of theengine-cylinder when the valve-faces are over the ports, substantiallyas described.

7. The combination in a cylinder-casting, of a valve-chamber, two portsconnecting the chamber with the cylinder, a false port in said chamber,a three-faced valve, recesses in each face of the valve running parallel.with the ports, and passagesin the valve connecting the recesses iu thevalveface adjacent to the false port with those in the faces adjacent toone of the ports leading to the cylinder, substantially as described.

S. In avalve of the characterdescribed, the combination of two sectionsmovable longitudinally upon one another, a recess across the end of thevalve extending into both sections and adapted to receive the T-shapedend of a valve-rod, substantially as described.

9. The combination in a cylinder-casting, of a valve-chamber, portstherein, a multiple-faced valve in said chamber, one of the facesthereof being movable relatively to the others, thereby providing meansfor varying IOS the diameter of the valve, substantially as FRANCISSCHUMANN.

fitnessesz WILLIAM E. BRADLEY, Jos. I-I. KLEIN.

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